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(No Model) I 0. W. & F. MANKEB. GALVANIG APPARATUS FOR. DENTAL SURGERY.

No. 423,616; Patented Mar. 18, .1890.

WITNESSES: l/VVE/VTOR:

4 L6 Y U ATTORNEYS.

' N PETERS. Photo-Lilhogmphnn Walhlnglcm B, C,

, MANKER, of Nebraska City,

UNITED STATES PATENT OFFICE.

' CHARLES YVM. MANKER, OF NEBRASKA CITY, NEBRASKA, AND GEORGE 1 5.MANKER, OF BEDFORD, IOWA, ASSIGNORS OF ONE-THIRD TO HENRY E. MANKER, OFELLIOTT, IOWA.

GALVANIC APPARATUS FOR DENTAL SURGERY.

SPECIFICATION forming part of Letters Patent No. 423,616, dated March18, 1890.

Application filed Augnst 23, 1889. Serial No. 321,752. (No model.)

To all whom it may concern.-

Be it known that We,CHARLES WILLIAM in the county of Otoe and State ofNebraska, and GEORGE F. MANKER, of Bedford, inthe county of Taylor andState of Iowa, have invented a new and Improved Apparatus for Use inDental Surgery, of which the following is at'ull, clear, and exactdescription, reference being had to the accompanying drawing, which is aplan View,

partly in section, of our improved galvanic apparatus.

The object of our invention is to construct a simple and eifectivegalvanic apparatus for use in connection with the forcepsin theextraction of teeth or other dental operations, the said apparatus beingdesigned to reduce the pain of the operation and treatment of oraldiseases.

Our invention consists in the combination, with a battery andinduction-coil, of an interrupter operated by two electro-magnets andprovided with two sets of contact-points.

It also consists in an adjustable interrupterarmature arranged to varythe speed of the breaks in'the primary circuit.

The invention also further consists in the combination, with theelectrodes running from the secondary wire of the induction-coil, ofrings adapted to be worn upon the fingers of the operator, either one ortwo fingers, as desired, for forming an electric contact with theforceps, all as will be hereinafter more fully described.

Upon a suitable base A is mounted'an induction-coil B,,provided with asoft-iron core a in the usual way. To the said core is fitted a slidingshield O, of brass or other non-mag netic material, by means of whichthe strength of the secondary current may be varied. The primary wire ofthe induction-coil is branched and connected with two magnets D D, andthe said magnets are connected with the posts E E, carryingcontact-screws b. The magnets D D' are connected up in adiagonallyopposite arrangement with the posts E E.

Between the contact-screws b is supported an armature-spring c by thepost d, the said post being slotted to receive the spring and providedwith a clamping-screw e for holding the spring a in any desiredposition. v To the free end of the armature-spring c is secured anarmature f, which is within the field of the polar extremities g g ofthe magnets D D. The post 61 is connected by a wire it with abinding-post z, and the said binding-post is connected with one pole ofthe battery F, the remaining pole of the battery being connected withthe binding-post Q1, and the said binding-post z" is connected with theremaining terminal of the primary coil.

The terminals of the secondary-coil are connected with the binding-postsjj', and to the base .A are secured the binding-posts k k, which areconnected electrically. The conductors Z Z are connected with thebindingposts 10 j and with the electrodes m m, which are to be held bythe hands of the patient, The conductors a n are connected with thebinding-posts j 70, also with rings 0 0',- or other means, which are tobe worn upon the fingers I breaking the secondary circuit. The secondarycurrent applied in the manner indicated relieves thepain of extraction.

The strength of current may be varied by moving the shield O in or outover the core a,

and the rapidity of the vibrations of the armatureand itsspring may bevaried by changing the adjustment of the armature-spring in the postcZ.

Having thus described our, invention, we claim as new and desire tosecure by Letters Patent- 1. The combination of the magnets D D, theadjustable armature-spring c and armature f, carriedthereby, thecontact-screws 1),.

and the electrical connections, substantially as specified;

2. The combination of the induction-coil B, the magnets D D, connectedin branch circuits, the armature-spring a, carrying the armature fi -thecontact-screws b, and the electrical connections,- substantially asspecified.

3. The combination, with the induction-coil B, of the conductors n Z,connected with the terminals of the secondary Wire, and the cond uctorsn Z, connected electrically, the said conductors Z 1' being providedwith electrodes m m and the conductors-n n being provided with theelectrodes 0 0- substantially as specified, which may be worn onseparatefingers or on one finger of the operator, as desired.

, GEORGE FL MANK'ER.

' WVitnesses:

FRANK A. REMINGTON, MAHLON *W. FULLER.

